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With Steel Train and Holly Miranda, 7 p.m. Saturday, February 27, at Warehouse Live, 813 St. Emanuel, 713-225-5483 or www.warehouselive.com.

For a pixie-ish twin sister act like Tegan and Sara, the inherent novelty and cuteness of your situation can be both a good and a bad thing. It's good because two physically identical, twentysomething siblings writing songs and strumming guitars in perfect unison is an automatic marketing hook. It's good because you know your musical partner down to her DNA. It's bad, however, because jaded indie snobs will scoff before they've even heard the album. From the moment Tegan and Sara emerged from Calgary, Alberta, in 2000, they've done everything necessary to quiet those critics who tried to brand them as something less than authentic. The sisters have released six increasingly popular, increasingly complex albums, culminating with last year's Sainthood. They've made every meaningful stop on the festival circuit, including Coachella, Bonnaroo and Austin City Limits. And all along they've steadfastly refused to ditch the matching haircuts.